Denomination: '43A56'
Previously Proposed Denomination: 'NS4571'
Botanical Name: Brassica napus
Applicant/Holder: Pioneer Hi-Bred Production LP
12111 Mississauga Road
Caledon, Ontario
L7C 1X1
Breeder: David Charne, Pioneer Hi-Bred Production Limited, Caledon, Ontario
Application Date: 2002-04-26
Application Number: 02-3065
Grant of Rights Date: 2004-03-09
Certificate Number: 1757
Exemption from compulsory licensing: Yes
Expiry date for exemption from compulsory licensing: 2006-03-09
Date rights surrendered: 2014-03-09

Variety Description

Varieties used for comparison: '45A01', '45A51', '45A71' and 'Excel'

Summary: '43A56' has narrower flower petals than 'Excel'. '43A56' has a narrower silique than '45A71'. The beak in '43A56' is longer than in '45A01' but shorter than in '45A51' and '45A71'. '43A56' is resistant to glyphosate while '45A01', '45A71', and 'Excel' are susceptible. '43A56' is susceptible to imidazolinone while '45A71' is resistant.


'43A56' is an open pollinated Roundup Ready spring canola variety. The cotyledons are medium in width and long. Leaf blades are medium to dark green with few sharp lobes which are shallow to medium in depth. The leaves are medium in length and width with a medium length petiole. The yellow flower petals are medium in length and narrow in width. The anthers shed pollen. The semi-erect to horizontal siliques are short to medium in length and narrow in width with a short to medium beak and pedicel length. The plants are short in height and mature very early in the season. Seed colour is brown to black. '43A56' has very low erucic acid content and low glucosinolates. The chlorophyll content is medium in '43A56'. '43A56' is resistant to glyphosate and susceptible to imidazolinone.

Origin & Breeding History: '43A56' was developed using the pedigree method at the Edmonton Research Center of Pioneer Hi-Bred International Inc. in 1998. Single plants and their progenies were selected for early maturity, lodging resistance, high oil, high protein, general vigor and uniformity. '43A56' was first evaluated in the preliminary yield tests in 2000, before it was entered in the wide area trials of Pioneer Hi-Bred in 2001. It was tested in the Western Canadian Public Coop test in 2002.

Tests & Trials: Tests and trials were conducted at Georgetown Research Center of Pioneer Hi-Bred Production Ltd., Georgetown, Ontario in the summers of 2001 and 2002. Each plot consisted of two rows spaced 0.5 metres apart and 2 metres in length, replicated three times in a RCB design.

Comparison tables for '43A56' with reference varieties '45A01', '45A51', '45A71' and 'Excel'

Flower petal width (mm)

  '43A56' '45A01' '45A51' '45A71' 'Excel'
mean 5.23 5.62 5.45 5.47 5.93

Silique width (mm)

  '43A56' '45A01' '45A51' '45A71' 'Excel'
mean 4.39 4.72 4.74 4.90 4.42

Beak length (mm)

  '43A56' '45A01' '45A51' '45A71' 'Excel'
mean 7.63 6.43 9.39 8.63 7.92
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